:root {
  --page: #f6f6f4;
  --surface: #ffffff;
  --ink: #182128;
  --muted: #64717b;
  --line: #d9dfdf;
  --line-strong: #b8c3c5;
  --red: #e30613;
  --red-dark: #b9000a;
  --green: #176c58;
  --green-soft: #edf7f3;
  --gold: #8b6418;
  --gold-soft: #fff8e8;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: var(--red-dark);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(16px, 4vw, 40px);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 6px;
  background: var(--red);
  color: #fff;
  font-size: 12px;
}

.nav-links {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.nav-links a {
  color: inherit;
  text-decoration: none;
}

.calculator-band {
  max-width: 1040px;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 46px) clamp(14px, 4vw, 28px);
}

.intro {
  max-width: 700px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--red-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(34px, 5vw, 52px);
}

h2 {
  font-size: clamp(22px, 3vw, 30px);
}

p {
  color: var(--muted);
}

.intro p:not(.eyebrow) {
  margin: 10px 0 0;
  font-size: 17px;
}

.calculator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 380px);
  gap: 14px;
  align-items: start;
}

.tool-panel,
.result-panel,
.article-card,
.article-copy section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.tool-panel,
.result-panel {
  padding: clamp(16px, 3vw, 24px);
}

.calculator-form {
  display: grid;
  gap: 16px;
}

.form-grid,
.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-row {
  display: grid;
  gap: 7px;
}

label,
legend {
  color: var(--ink);
  font-weight: 750;
}

legend {
  margin-bottom: 8px;
}

.money-field {
  display: grid;
  grid-template-columns: 58px 1fr;
  min-height: 52px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
}

.money-field span {
  display: grid;
  place-items: center;
  background: #eef1f0;
  color: var(--muted);
  font-weight: 800;
}

input[type="number"] {
  min-width: 0;
  width: 100%;
  border: 0;
  padding: 0 12px;
  color: var(--ink);
  font: inherit;
  font-size: 18px;
  font-weight: 800;
}

input[type="number"]:focus {
  outline: 3px solid rgba(227, 6, 19, 0.14);
  outline-offset: -3px;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.segmented-field {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.segmented-field legend {
  grid-column: 1 / -1;
}

.segmented-field label,
.option-list label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 46px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfbfa;
  cursor: pointer;
}

.option-list {
  display: grid;
  gap: 8px;
}

.option-list label span {
  display: grid;
  gap: 3px;
}

.option-list small {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

input[type="radio"] {
  flex: 0 0 auto;
  width: 17px;
  height: 17px;
  margin-top: 2px;
  accent-color: var(--red);
}

.segmented-field label:has(input:checked),
.option-list label:has(input:checked) {
  border-color: var(--red);
  background: #fff7f7;
}

.result-panel {
  position: sticky;
  top: 14px;
  display: grid;
  gap: 16px;
}

.status-strip {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid #ffc9c9;
  border-radius: 8px;
  background: #fff6f6;
}

.status-strip span {
  color: var(--red-dark);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.status-strip strong {
  font-size: 15px;
  line-height: 1.3;
}

.status-strip.is-free {
  background: var(--green-soft);
  border-color: #adddca;
}

.status-strip.is-free span {
  color: var(--green);
}

.status-strip.is-caution {
  background: var(--gold-soft);
  border-color: #e7cd94;
}

.status-strip.is-caution span {
  color: var(--gold);
}

.result-list {
  display: grid;
  margin: 0;
}

.result-list div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.result-list div:first-child {
  padding-top: 0;
}

.result-list div:last-child {
  border-bottom: 0;
}

dt {
  color: var(--muted);
  font-weight: 700;
}

dd {
  margin: 0;
  color: var(--ink);
  font-size: 19px;
  font-weight: 850;
  text-align: right;
  white-space: nowrap;
}

.total-row {
  align-items: center;
  margin-top: 4px;
  padding: 14px !important;
  border: 1px solid var(--line) !important;
  border-radius: 8px;
  background: #f7faf8;
}

.total-row dt {
  color: var(--ink);
}

.total-row dd {
  color: var(--green);
  font-size: clamp(28px, 4vw, 36px);
  line-height: 1;
}

.result-note {
  margin: 0;
  font-size: 13px;
}

.simple-info {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.8fr);
  gap: 28px;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 clamp(14px, 4vw, 28px) 44px;
}

.simple-info h2 {
  font-size: 22px;
}

.simple-info p {
  margin: 10px 0 0;
}

.simple-info ul {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.simple-info li {
  margin: 6px 0;
}

.guide-links {
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 22px clamp(16px, 4vw, 40px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: var(--surface);
  font-size: 14px;
}

.button {
  display: inline-grid;
  min-height: 42px;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 16px;
  background: var(--red);
  color: #fff;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
}

.article-hero {
  padding: clamp(30px, 6vw, 64px) clamp(16px, 4vw, 40px) 18px;
}

.article-hero-inner,
.article-layout {
  max-width: 1040px;
  margin: 0 auto;
}

.article-hero h1 {
  max-width: 860px;
  font-size: clamp(34px, 5vw, 56px);
}

.article-hero p {
  max-width: 740px;
  font-size: 18px;
}

.article-band {
  padding: 24px clamp(16px, 4vw, 40px) 64px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 18px;
  align-items: start;
}

.article-copy {
  display: grid;
  gap: 14px;
}

.article-copy section,
.article-card {
  padding: clamp(18px, 3vw, 24px);
}

.article-card {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 14px;
}

.article-card p {
  margin: 0;
}

.article-layout ul {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.article-layout li {
  margin: 6px 0;
}

@media (max-width: 880px) {
  .calculator-grid,
  .simple-info,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .result-panel,
  .article-card {
    position: static;
  }
}

@media (max-width: 620px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .form-grid,
  .choice-grid {
    grid-template-columns: 1fr;
  }

  .result-list div {
    display: grid;
    gap: 4px;
  }

  dd {
    text-align: left;
  }
}